焊接接头根部预留间隙的作用是在于()。
A.防止烧穿
B.保证焊透
C.减少应力
D.提高效率
参考答案:B
()能最大限度的利用水能资源发电。
A.大型水电站
B.引流电站
C.梯级电站
D.抽水蓄能电站
The most effective first aid treatment for chemical burns is to immediately().
A.apply ointment to the burned area
B.flood the affected area with water
C.wrap the burn with sterile dressing
D.apply an ice pack to the burned area